I have previously outlined my problems earlier under the title 'Loss of low speed smoothness' but I feel its gone beyond this.
Background info, conversion using 95 SC400 motor, Supra W58, with uncut wiring and standard ECU. Run well for 18 months without problem. Has always had codes 27, 29 and 42 as none of these sensors are installed. Because I have been unable to make sense of whats happening I've had my mechanic look at it but he also is stumped.
Problem, when parked the car idles as normal and revs out without complaint. When driven, there's no response from the motor unless you can get it above 2500rpm, then there's instant, neck snapping power. Below the 2500rpm, driving is difficult, with a feeling the cars power is being retarded and you cannot accelerate.
What I cannot understand is that this problem can be temporarily fixed by disconnecting the battery, giving you a 5km break from the madness. Cold start, hot start, short drive, long drive, it makes no difference. Once the problem returns it won't go away and there's no error codes to point to the problem. Does this suggest its the ECU? I've checked all wires and connections as well as inside the ECU but cannot see anything out of place or 'burnt' and I've been unable to locate a replacement to swap in to test.
Is there something I've missed or can try to narrow this problem down, as my limited knowledge on this has been exhausted. I am open to any and all suggestions or offers to get to the bottom of this.
Background info, conversion using 95 SC400 motor, Supra W58, with uncut wiring and standard ECU. Run well for 18 months without problem. Has always had codes 27, 29 and 42 as none of these sensors are installed. Because I have been unable to make sense of whats happening I've had my mechanic look at it but he also is stumped.
Problem, when parked the car idles as normal and revs out without complaint. When driven, there's no response from the motor unless you can get it above 2500rpm, then there's instant, neck snapping power. Below the 2500rpm, driving is difficult, with a feeling the cars power is being retarded and you cannot accelerate.
What I cannot understand is that this problem can be temporarily fixed by disconnecting the battery, giving you a 5km break from the madness. Cold start, hot start, short drive, long drive, it makes no difference. Once the problem returns it won't go away and there's no error codes to point to the problem. Does this suggest its the ECU? I've checked all wires and connections as well as inside the ECU but cannot see anything out of place or 'burnt' and I've been unable to locate a replacement to swap in to test.
Is there something I've missed or can try to narrow this problem down, as my limited knowledge on this has been exhausted. I am open to any and all suggestions or offers to get to the bottom of this.